Footprint - the area in which a specific transmission can be received. Some footprints cover as much as one-third of the earth, such as satellite or cell systems.
覆盖面-某个卫星信号覆盖的区域。有些卫星信号覆盖面非常大，达整个地球的三分之一，例如卫星或手提电话系统等。
The gravity on the surface of Mars is about one third as strong as it is on earth.
火星表面的引力大约是地球表面引力的三分之一。
The gravity on the surface of Mars is about one third as strong as it is on earth.
火星表面的引力大约是地球表面引力的三分之一。
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